1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Sharp LS037V7DW01 LCD Panel Driver 4 * 5 * Copyright (C) 2019 Texas Instruments Incorporated 6 * 7 * Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver 8 * 9 * Copyright (C) 2013 Texas Instruments Incorporated 10 * Author: Tomi Valkeinen <tomi.valkeinen@ti.com> 11 */ 12 13 #include <linux/delay.h> 14 #include <linux/gpio/consumer.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/platform_device.h> 18 #include <linux/regulator/consumer.h> 19 20 #include <drm/drm_connector.h> 21 #include <drm/drm_modes.h> 22 #include <drm/drm_panel.h> 23 24 struct ls037v7dw01_panel { 25 struct drm_panel panel; 26 struct platform_device *pdev; 27 28 struct regulator *vdd; 29 struct gpio_desc *resb_gpio; /* low = reset active min 20 us */ 30 struct gpio_desc *ini_gpio; /* high = power on */ 31 struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */ 32 struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */ 33 struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */ 34 }; 35 36 #define to_ls037v7dw01_device(p) \ 37 container_of(p, struct ls037v7dw01_panel, panel) 38 39 static int ls037v7dw01_disable(struct drm_panel *panel) 40 { 41 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel); 42 43 gpiod_set_value_cansleep(lcd->ini_gpio, 0); 44 gpiod_set_value_cansleep(lcd->resb_gpio, 0); 45 46 /* Wait at least 5 vsyncs after disabling the LCD. */ 47 msleep(100); 48 49 return 0; 50 } 51 52 static int ls037v7dw01_unprepare(struct drm_panel *panel) 53 { 54 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel); 55 56 regulator_disable(lcd->vdd); 57 return 0; 58 } 59 60 static int ls037v7dw01_prepare(struct drm_panel *panel) 61 { 62 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel); 63 int ret; 64 65 ret = regulator_enable(lcd->vdd); 66 if (ret < 0) 67 dev_err(&lcd->pdev->dev, "%s: failed to enable regulator\n", 68 __func__); 69 70 return ret; 71 } 72 73 static int ls037v7dw01_enable(struct drm_panel *panel) 74 { 75 struct ls037v7dw01_panel *lcd = to_ls037v7dw01_device(panel); 76 77 /* Wait couple of vsyncs before enabling the LCD. */ 78 msleep(50); 79 80 gpiod_set_value_cansleep(lcd->resb_gpio, 1); 81 gpiod_set_value_cansleep(lcd->ini_gpio, 1); 82 83 return 0; 84 } 85 86 static const struct drm_display_mode ls037v7dw01_mode = { 87 .clock = 19200, 88 .hdisplay = 480, 89 .hsync_start = 480 + 1, 90 .hsync_end = 480 + 1 + 2, 91 .htotal = 480 + 1 + 2 + 28, 92 .vdisplay = 640, 93 .vsync_start = 640 + 1, 94 .vsync_end = 640 + 1 + 1, 95 .vtotal = 640 + 1 + 1 + 1, 96 .vrefresh = 58, 97 .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED, 98 .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC, 99 .width_mm = 56, 100 .height_mm = 75, 101 }; 102 103 static int ls037v7dw01_get_modes(struct drm_panel *panel) 104 { 105 struct drm_connector *connector = panel->connector; 106 struct drm_display_mode *mode; 107 108 mode = drm_mode_duplicate(panel->drm, &ls037v7dw01_mode); 109 if (!mode) 110 return -ENOMEM; 111 112 drm_mode_set_name(mode); 113 drm_mode_probed_add(connector, mode); 114 115 connector->display_info.width_mm = ls037v7dw01_mode.width_mm; 116 connector->display_info.height_mm = ls037v7dw01_mode.height_mm; 117 /* 118 * FIXME: According to the datasheet pixel data is sampled on the 119 * rising edge of the clock, but the code running on the SDP3430 120 * indicates sampling on the negative edge. This should be tested on a 121 * real device. 122 */ 123 connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH 124 | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE 125 | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE; 126 127 return 1; 128 } 129 130 static const struct drm_panel_funcs ls037v7dw01_funcs = { 131 .disable = ls037v7dw01_disable, 132 .unprepare = ls037v7dw01_unprepare, 133 .prepare = ls037v7dw01_prepare, 134 .enable = ls037v7dw01_enable, 135 .get_modes = ls037v7dw01_get_modes, 136 }; 137 138 static int ls037v7dw01_probe(struct platform_device *pdev) 139 { 140 struct ls037v7dw01_panel *lcd; 141 142 lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL); 143 if (!lcd) 144 return -ENOMEM; 145 146 platform_set_drvdata(pdev, lcd); 147 lcd->pdev = pdev; 148 149 lcd->vdd = devm_regulator_get(&pdev->dev, "envdd"); 150 if (IS_ERR(lcd->vdd)) { 151 dev_err(&pdev->dev, "failed to get regulator\n"); 152 return PTR_ERR(lcd->vdd); 153 } 154 155 lcd->ini_gpio = devm_gpiod_get(&pdev->dev, "enable", GPIOD_OUT_LOW); 156 if (IS_ERR(lcd->ini_gpio)) { 157 dev_err(&pdev->dev, "failed to get enable gpio\n"); 158 return PTR_ERR(lcd->ini_gpio); 159 } 160 161 lcd->resb_gpio = devm_gpiod_get(&pdev->dev, "reset", GPIOD_OUT_LOW); 162 if (IS_ERR(lcd->resb_gpio)) { 163 dev_err(&pdev->dev, "failed to get reset gpio\n"); 164 return PTR_ERR(lcd->resb_gpio); 165 } 166 167 lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0, 168 GPIOD_OUT_LOW); 169 if (IS_ERR(lcd->mo_gpio)) { 170 dev_err(&pdev->dev, "failed to get mode[0] gpio\n"); 171 return PTR_ERR(lcd->mo_gpio); 172 } 173 174 lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1, 175 GPIOD_OUT_LOW); 176 if (IS_ERR(lcd->lr_gpio)) { 177 dev_err(&pdev->dev, "failed to get mode[1] gpio\n"); 178 return PTR_ERR(lcd->lr_gpio); 179 } 180 181 lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2, 182 GPIOD_OUT_LOW); 183 if (IS_ERR(lcd->ud_gpio)) { 184 dev_err(&pdev->dev, "failed to get mode[2] gpio\n"); 185 return PTR_ERR(lcd->ud_gpio); 186 } 187 188 drm_panel_init(&lcd->panel); 189 lcd->panel.dev = &pdev->dev; 190 lcd->panel.funcs = &ls037v7dw01_funcs; 191 192 return drm_panel_add(&lcd->panel); 193 } 194 195 static int ls037v7dw01_remove(struct platform_device *pdev) 196 { 197 struct ls037v7dw01_panel *lcd = platform_get_drvdata(pdev); 198 199 drm_panel_remove(&lcd->panel); 200 drm_panel_disable(&lcd->panel); 201 drm_panel_unprepare(&lcd->panel); 202 203 return 0; 204 } 205 206 static const struct of_device_id ls037v7dw01_of_match[] = { 207 { .compatible = "sharp,ls037v7dw01", }, 208 { /* sentinel */ }, 209 }; 210 211 MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match); 212 213 static struct platform_driver ls037v7dw01_driver = { 214 .probe = ls037v7dw01_probe, 215 .remove = ls037v7dw01_remove, 216 .driver = { 217 .name = "panel-sharp-ls037v7dw01", 218 .of_match_table = ls037v7dw01_of_match, 219 }, 220 }; 221 222 module_platform_driver(ls037v7dw01_driver); 223 224 MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@ti.com>"); 225 MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver"); 226 MODULE_LICENSE("GPL"); 227